In a new interview with TV Guide, co-showrunner Jed Whedon explains what brings Sif to Earth. "Lady Sif comes here on a hunting mission -- sent by Odin -- to find her arch-enemy Lorelei and bring her back to Asgard," he says. "It throws our agents for a loop when they find themselves in a fight right alongside this powerful woman from Thor's world."

Zap2it got a sneak peek at the showdown between Sif and Lorelei when we visited the set back in January, and it's pretty intense. Let's just say that there's a bit of a dispute over who has the hots for Thor.

While the men of "Agents of SHIELD" will be enraptured with sorceress Lorelei, it's Lady Sif who catches Melinda May's eye. "She is a woman warrior and she's godlike and she has to wear these kicka** boots and I was so happy I wasn't the only one who had to walk around this awful floor and fight in high heel boots," Ming-Na Wen told Zap2it with a laugh while on set. "It was just nice to have someone else on set to empathize with."

Though Sif is on Earth for business, she's not without her (unintentional) comedic relief. "The language barriers, it was really fun to write," Whedon told Zap2it of conversations between the SHIELD team and Lady Sif. Fellow showrunner Maurissa Tancharoen added, "And seeing how she will take something literally. If Coulson will throw a line at her, she actually does the literal version of that physically."

Alexander's episode of "Agents of SHIELD" will air on ABC on March 11 at 8 p.m. ET/PT.